Because of time’s arrow, my daughter, who was once a toddler, is now a preteen. A new question thus arises: When should I let her get a smartphone? This problem isn’t new to me. I have two older kids, ...

Kara Alaimo is a professor of communication at Fairleigh Dickinson University. Her book “Over the Influence: Why Social Media Is Toxic for Women and Girls — And How We Can Take It Back” was published ...